Collapsed steering shaft? Help!

The pieces that fell out do belong in the box coupling.
Why the shaft falls short of reaching into the coupling is a mistery to me.
If the steering column is still bolted to the floor and dash the shaft had to have had the sheer pin broken. Sheer pins could have been defeated by a previous owner who needed to fit the shaft to a mismatch steering gear. There's about 3 inches difference between manual and power sterring shafts.
To fix all of that properly you would need to take the entire steering column and the box coupling to the workbench and buy a box coupling rebuild kit.